zink: workaround depth sampler border color when z24 is z32

zink: workaround depth sampler border color when z24 is z32

If there is a z24 unorm depth buffer, but it's the hw is using
a z32, the border color needs to be clamped appropriately.

This creates a second sampler with the clamped border color,
and uses it if needed. The checks might need some tightening up.

Fixes: zink on radv
dEQP-GLES31.functional.texture.border_clamp.range_clamp.nearest_unorm_depth
dEQP-GLES31.functional.texture.border_clamp.range_clamp.nearest_unorm_depth_uint_stencil_sample_depth

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17305>